<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path:'/goods' }">商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 消息提示条 -->
      <el-alert
        title="添加商品信息" type="info" center show-icon
        :closable="false">
      </el-alert>
      <!-- 进度条 -->
      <!-- 字符串减去一个数值0可以得到一个数值 -->
      <el-steps :space="200" :active="activeIndex - 0"
                finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域  -->
      <!--Form表单提供的一个属性,可以使文本框居上下,左右 -->
      <el-form :model="addForm" :rules="addFormRules"
               ref="addFormRef" label-width="100px"
               :label-position="'top'">
      <!-- Tabs标签页提供了步骤条和tab栏的联动的属性 -->
      <el-tabs :tab-position="'left'"
               v-model="activeIndex" :before-leave="beforeTableave"
               @tab-click="tabClicked">
        <!-- el-tab-pane只能作为el-tabs的子栏 -->
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader
              v-model="addForm.goods_cat" expand-trigger="hover"
              :options="catelist"
              :props="cateProps"
              @change="handleChange"></el-cascader>
          </el-form-item>

        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
          <!-- 渲染表单的Item项 -->
          <el-form-item :label="item.attr_name"
                        v-for="item in manyTableData" :key="item.attr_id">
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals"
                           :key="i">
              </el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item :label="item.attr_name"
                        v-for="item in onlyTableData" :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <!-- action 表示图片要上传到的后台api地址 picture 表示以缩略图的形式上传-->
          <el-upload :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove"
            list-type="picture" :headers="headerObj"
                     :on-success="handleSuccess">
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
          <!-- 富文本编辑器组件 -->
          <quill-editor v-model="addForm.goods_introduce"></quill-editor>
          <!-- 添加商品的按钮 -->
          <el-button type="primary" class="btnAdd" @click="add">
            添加商品
          </el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>

    </el-card>

    <!-- 图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'
export default {
  data(){
    return{
      activeIndex:'0',
      //  添加表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //  商品所属的分类数组
        goods_cat: [],
        //  图片的数组
        pics: [],
        //  商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {required: true,message: '请输入商品名称', trigger: 'blur'}
        ],
        goods_price: [
          {required: true,message: '请输入商品价格', trigger: 'blur'}
        ],
        goods_weight: [
          {required: true,message: '请输入商品重量', trigger: 'blur'}
        ],
        goods_number: [
          {required: true,message: '请输入商品数量', trigger: 'blur'}
        ],
        goods_cat: [
          {required: true,message: '请输入商品数量', trigger: 'blur'}
        ]
      },
      //  商品分类列表
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      //  动态参数列表数据
      manyTableData: [],
      //  静态属性列表
      onlyTableData:[],
      //  上传图片的url地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      //  图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      //  隐藏图片预览
      previewVisible: false
    }
  },
  created(){
    this.getCateList()
  },
  methods:{
    //  获取所有商品分类数据
    async getCateList(){
      const {data: res} = await this.$http.get('categories')

      if(res.meta.status !== 200){
        return this.$message.error('获取商品分类数据失败')
      }

      this.catelist = res.data
      this.$message.success('获取商品分类成功')
//      console.log(this.catelist)
    },
    //  级联选择器选中项变化,会触发这个函数 (默认只能选三级)
    handleChange(){
//      console.log(this.addForm.goods_cat)
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
      }
    },
    //  切换标签页前判断是否选择了三级分类
    beforeTableave(activeName, oldActiveName){
//      console.log('即将离开的标签页名字是:' + oldActiveName)
//      console.log('即将进入的标签页名字是:' + activeName)

      if(oldActiveName === '0' &&
        this.addForm.goods_cat.length !== 3){
        this.$message.error('请选择商品分类!')
        return false
      }
    },
    async tabClicked(){
//      console.log(this.activeIndex)
      //  证明访问的是动态参数面板
      if(this.activeIndex === '1'){
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
          { params: {sel: 'many'}
          })

      if(res.meta.status !== 200){
        return this.$message.error('获取动态参数列表失败!')
      }
//        console.log(res.data)
       res.data.forEach(item => {
         item.attr_vals = item.attr_vals.length === 0
           ? [] : item.attr_vals.split(' ')
       })

        this.manyTableData = res.data
//        console.log(this.manyTableData)
      } else if(this.activeIndex === '2'){
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
          { params: {sel: 'only'}
          })

        if(res.meta.status !== 200){
          return this.$message.error('获取静态属性失败!')
        }

//        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    //  处理图片预览效果
    handlePreview(file){
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //  处理移除图片的操作
    handleRemove(file){
//      console.log(file)
      //  1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      //  2.从 pics 数组中,找到这个图片对应的索引值(引用findIndex这个方法快速找到当前对应的索引值)
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      //  3.调用数组的 splice 方法,把图片的信息对象,从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
//      console.log(this.addForm)
    },
    //  监听图片上传成功的事件
    handleSuccess(response){
      console.log(response)
      //  1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      //  2.将图片信息对象,push到pics数组中
      this.addForm.pics.push(picInfo)
//      console.log(this.addForm)
    },
    add(){
      this.$refs.addFormRef.validate(async valid => {
        if(!valid){
          return this.$message.error('请填写必填项')
        }
        //  执行添加业务的逻辑
        //  lodash cloneDeep(obj)  深复制
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        //  处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id,
            //  attr_value传递的必须是数组
          attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        //  处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id,
            //  attr_value传递的必须是数组
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })

        console.log(form)

        //  发起请求添加商品
        //  商品的名称,必须是唯一的
        const { data: res} = await this.$http.post('goods', form)

        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败!')
        }

        this.$message.success('添加商品成功!')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId(){
      if (this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
  .el-checkbox{
    margin: 0 10px 0 0;
  }
  .previewImg{
    width:100%;
  }
  .btnAdd{
    margin-top:15px;
  }
</style>
